Sandpaper holder



FIG. 1 is a perspective view looking towards the front of a sandpaper holder showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a front end view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a rear end view thereof. 

The ornamental design for a sandpaper holder, substantially as shown. 